> Any number of dimensions could have worked equally well at this point; there wasn’t really any way to tell the difference between a universe with one dimensio

> Any number of dimensions could have worked equally well at this point; there wasn’t really any way to tell the difference between a universe with one dimension and a universe with seven. What is that supposed to mean? Presumably you could still, if you were a being able to withstand the crazy physical conditions in the early universe, tell whether the universe had three or more or less dimensions? What's hindering such experiments in the early universe?